Alternating Current Test

Result

Alternating Current Test - 10

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Weekly Quiz Competition

Question 1
4 / -1

An ideal choke draws a current of 8 A when connected to an AC supply of 100 V, 50 Hz. A pure resistor draws a current of 10 A when connected to the same source. The ideal choke and the resistor are connected in series and then connected to the AC source of 150 V, 40 Hz. The current in the circuit becomes

A

B
8 A

C
18 A

D
10 A

Solution
Question 2
4 / -1

A 50 V AC is applied across an R-C (series) network. The rms voltage across the resistance is 40 V, then the potential across the capacitance would be

A
10 V

B
20 V

C
30 V

D
40 V

Solution
Question 3
4 / -1

A pure inductive coil of 30 mH is connected to an AC source of 220 V, 50 Hz. The rms current in the coil is

A
50.35 A

B
23.4 A

C
30.5 A

D
12.3 A

Solution
Question 4
4 / -1

Same current is flowing in two alternating circuits. The first circuit contains only inductance and the other contains only a capacitor. If the frequency of the emf of AC is increased, the effect on the value of the current

A
increases in the first circuit and decreases in the other

B
increases in both the circuits

C
decreases in both the circuits

D
decreases in the first circuit and increases in the other

Solution
Question 5
4 / -1

The maximum value of AC voltage in a circuit is 707 V. Its rms value is

A
70.7 V

B
100 V

C
500 V

D
707 V

Solution
Question 6
4 / -1

If an alternating voltage is represented as E= 141 sin (628 t), then the rms value of the voltage and the frequency are respectively

A
141 V, 628 Hz

B
100 V, 50 Hz

C
100 V, 100 Hz

D
141 V, 100 Hz

Solution
Question 7
4 / -1

In an ideal choke, ratio of its inductance L to its DC resistance R is

A
infinity

B
zero

C
unity

D
hundred

Solution
Question 8
4 / -1

For a series L-C-R circuit at resonance, the statement which is not true, is

A
peak energy stored by a capacitor = peak energy stored by an inductor

B
average power = apparent power

C
wattless current is zero

D
power factor is one

Solution
Question 9
4 / -1

In a choke coil, the reactance X_L and resistance R are such that

A
X_L = R

B
X_L > > R

C
X_L < < R

D
X_L = ∞
Question 10
4 / -1

A 100 V, AC source of frequency 500 Hz is connected to an L-C-R circuit with L= 8.1 mH C =12.5µF, R =10Ω all connected in series as shown in figure. What is the quality factor of circuit?

A
2.02

B
2.5434

C
20.54

D
200.54

Solution